Bit-dressing machine



A F. M. LEE. BIT DRESSING MACHINE.

APPLICATION FILED AUG..2, |920.

Patented Feb. 21, 1922.

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unirse BIT-DRESSING 'Meer-HNE.

Specication of Letters Patent. Patentd Feb. 21

Application filed August 2, 1920. Serial .Nm-400,753.

To all whom tmctg/ conce/Mt.'

Be it known that/I, Fonnns'r M. LEE, a citizen of the. United States,Aresiding at Geneva, in the county of Adams, State of Indiana, haveinvented certain new and useful Improvements in BitiDressing Machines;and If do hereby declare the following to be a full, clear, and exactdescription of the invention, ysuch as will enable others skilled in theart to which it appertains to make and use the same. i

This V"invention relates to the making of Vmetal tools, and moreespecially to machines for forming and sharpening drills; `and theobject of the same is to produce a machine of this kind intended forshaping the cutting ends of bits which are used 1n drilling wells.`These bits are about six feetv long with a cutting face of from ten totwenty inches, and alarve bit will oftenweigh nearly a ton. Theircutting faces soon be- 1 come .jammed and misshapen, especially whendrilling in rock or stone,y and thedrill mustthen be Vwithdrawn fromthecasing' and reshaped or sharpened. Manifestly time is saved iftheworn drill is replaced by a new one so that thepdrilling operation isnot interrupted,'and the purpose of the present invention is to producea machine for quickly dressing drills of'various lengths, as they arebrought to it from the several wells of a group. v

' Gnepractical embodiment of the'invention isset f orth below: and shownin the drawings wherein: l

Figure 1-is aplan View, Figure 2 a longitudinal section, Figure 3 a.cross section on the line 3 3 of Figure 1. and Figure 4 is a section onthe line 4 4 thereof. Y

The numeral 1 designates broadly a rectangular framework having near oneend 'a pair of bearings 2 for a main shaft 3 carrying fast and loosepulleys 4 and 5 as shown and to which power may be applied by a belt notshown and capable of being shifted from one pulley to another by a beltshifter also not shown. lWounted in other bearings 6 on the framework isa crank shaft 7 connected by gearing 8 with the main shaft, the- Theblows impartedl bythe hammer create p jar which is communicated to thecrank shaft and its bearings rather than to the main shaft and itsbearings, leaving it possible to replace or repair the former :withouttouching the latter. Again, if the shafts rotate at-different speedsthej ar occasioned by each blow of the hammer is .not alwa'vs impartedto the main shaft at the same poiiit 1n its reyolution, which mightunduly lwear the driving belt. There are other consider'- ations, butthese will be sufficient'. r

Mounted in guides 10 along the frame? work is a cross head 11 connectedby a pitman 12vv withv the 'crank 9. Mounted lin the same guides is asecond cross head 13 carrying ahammer 14whose face 15 is shaped toconform .with the configuration which itis desired to give the cuttingedge 'or-y face lF of the bit B. From the cross head 13 a number ofbolts lextend outwardthrough eyes in the cross head 11, and stout coiledsprings 17 are disposed between the cross heads and A onsald boltsbeyond the outer cross headv and inside of nuts 18 'upontheboltsTherefore-the rapid revolution ofthe crank shaft sov resultsv inrcciprocations of the ,hammer 14 whose blows areV to an extent cushionedto the cross head 11 by the springs. l

On a cross bar 20 upon the framework are mountedtwo 4knees 21 asbestseen -in Figure 3, screws 22 extending through slots 23 in thekneesfor holding them adjustable onthe cross bar,-and between theupturnedinner ends of ythe kneesis mounted the body of the bit B. .Furtheroutward uponthe framework is slidably mounted a second work holder aisbest seen in Figure 4. p 'This consists of a block 24 having a socket'25 .in its .face` forv the threadedend 'of the bitshank,'fand jaws'26lslidably engaging the side bars of the framework. Yet outside'.

the first block directly behind the socket in.`

the latter. This second block may also have set screws 29 engagingselected. holes 30 disposedin series alongthe side bars ofthe framework.

In the use of this machine the blocks are y adjusted in proportion tothe length of the bit, the extremity of its shankfis inserted in thesocket 25," and its body is disposed between the knees 21 with itscutting edge or face F toward the hammer 14.` vPoweris now applied. tothe fast pulley and the main shaft drives the crank 'shaft so that thehammer begins its .reciprocations Now by setting up the set screw 28thro-ugh the outer block, the inner block is advanced slowly and itmoves the bit B inward, sliding it overfthe cross bar 20 and betweenvthe knees 2l thereon. Eventually the face F comes within reach of thehammer 14 at the eXtreme of each stroke of the latter, and the mostpronounced distortions of the face are acted upon first. Subsequentadvance of the bit results in the gradual swaging 'and dressing of itsface, so that it is rapidly shaped and sharpened, perhaps to such adegree that it is unnecessary even to nish it with other tools beforerestoring it to use. -Manifestly the active face of the hammer must beshaped to produce this resultas rapidly as possible and with the leastwear to the hammer, although from time to time it will be necessary toreplace the hammer with a new one. As suggested above, the jar createdby the rapid blows of the heavy hammer on the bit, is cushioned to thecross head" 11 and pitman and crank shaft, with the result that the ldriving mechanism will last a long time.

" drawn out of the rear To replace the hammer the `nuts are run off therear ends of the bolts which connect the two cross heads7 and Athe boltscross .head and springs, and another hammer with appropriate boltssubstituted in a manner which will be clear. A single bit dressingmachine of thisv type would be suiiicient to treat the bits ofv quite agroup of wells,

provided each drill rig is Vsupplied withv two or three bits so that afresh one may be kept constantly at work.

The machine is thus described in its simplest form. We prefer to provideguides over the gearing, as indicated in outline at 31and there will bea block and tackle or a conveyer or other mechanism by which heavy bitscan be put into place and removed. Of course the machine is not confinedto the shaping of bits as specifically set forth, but if it isemployedrfor other work the face of the hammer will be modified tocorrespond.

`What is claimed is:

l. In a bit dressing machine, the combination with a framework, andmeans on one end thereof for adjustably supporting the work; of a powershaftgjour'naled across the other end of the framework, a crank shaftmounted adjacent thereto, gearingconnecting said shafts tovcause theirrotation at different speeds, a 'cross head slidably mounted on theframework, a pitman connecting it with the crank shaft, ax-second crosshead mounted on the framework for; ward of the first, bolts projectingfrom this cross head through openingsy in v'the first, springs on thebolts at opposite sides ofthe rst cross head, and a hammer carried bythe second cross head. Y 2. ln a bit dressing machine, the combinationwith ka framework, aA .hammer mounted on one end thereof, and Vmeans forreciprocating-it; of a bar across the other end of the framework, kneesonsaid bar adjustable toward and from each other,

two blocks slidably mounted on the framework beyond said bar, the innerblock having a socket for the end of the bit-shank, anda set screwthrough the outerA block against the inner. i

3. ln a bit dressing machine, the combination with a framework,l arhammer mounted on one end thereof, and means for reciprocating it; of abar across. the other end of the framework, knees onfsa'id'baradjustable toward and from each other, two blocks slidably mounted vonthe framework beyond said bar, means on the'inner block for engaging thebitnshank, a set screw through the outer block against thel inner, andmeans for setting the outer block Yat various `.positions along theframework.

In testimony whereof, afiix my signature, in the presence of twowitnesses. "v

l FonREsfr LEE. Witnesses CLIFFORD KING, J. D. Ermes.

